✦ LIBER ✦

17O and 29Si MAS NMR study of β–C2S hydration and the structure of calcium-silicate hydrates

✍ Scribed by Xiandong Cong; R. James Kirkpatrick

Publisher: Elsevier Science
Year: 1993
Tongue: English
Weight: 709 KB
Volume: 23
Category: Article
ISSN: 0008-8846
DOI: 10.1016/0008-8846(93)90166-7

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✦ Synopsis

1tO and 29Si MAS and CPMAS NMR spectroscopy has been used to study the mechanism of hydration of/3-C2S and the structure of calcium silicate hydrates (CSH) formed both during hydration of/3-C2S and synthesized separately. /3-C2S was reacted with H~70 at room temperature for up to 100 days. Synthesized CSH was made from silica gel and CaCl2 solution made with 11170. All the 170 NMR signal from the reaction products is from 170 originally in the water. The local oxygen environments detected in CSH are Si-O-Ca, Si-O-Si, Ca-OH and possibly Si-OH. Ca-OH sites are also present in Ca(OH)2 accompanying the CSH. The hydration mechanism and CSH structure are discussed.

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